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    ###### tags: `第13屆IT邦鐵人賽文章` # 【在 iOS 開發路上的大小事-Day09】將常用的 Function 寫成一個 class,讓各個檔案都能使用 在開發上,常常會有一些 Function 是會在各個檔案中使用的,如果每次都要在需要用到這個 Function 的時候都重寫一次一樣的 Function,實在是有點沒效率 所以就來開始吧! # 實作! 這邊我是打算示範 Alert 提示框跟取得系統時間這兩個 Function,因為這兩個算是我蠻常用到的 首先先新增一個 Swift 檔案 ![](https://i.imgur.com/scMvoeS.png) 檔名就自行取,但記得開頭要大寫英文字母!!! 新增好之後,裡面會是空的,像下面這樣,CustomFunc 是我剛剛取的檔名 ```swift= import Foundation class CustomFunc { } ``` 之所以會選 Alert 跟一般函式來做示範 是因為兩者有一點點不一樣,一個是 UI 元件,一個是普通 Function 先來示範 Alert 的寫法,這邊示範的是只有一個關閉按鈕的,由於 Alert 是屬於 UI 元件,也就是 UIAlertController,所以在最上面要記得引入 UIKit,不然可是無法使用的! 還有一點是如果是一人開發的話,那可能還好,如果是多人開發的話,那建議還是寫一下每個參數的說明會比較好一點,不然修 bug 的時候可能會找到懷疑人生🤣 ```swift= import Foundation import UIKit class CustomFunc { /// 提示框 /// - Parameters: /// - title: 提示框標題 /// - message: 提示訊息 /// - vc: 要在哪一個 UIViewController 上呈現 /// - actionHandler: 按下按鈕後要執行的動作,沒有的話,就填 nil class func customAlert(title: String, message: String, vc: UIViewController, actionHandler: (() -> Void)?) { let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert) let closeAction = UIAlertAction(title: "關閉", style: .default) { action in actionHandler?() } alertController.addAction(closeAction) vc.present(alertController, animated: true) } } ``` 再來是普通 Function 的寫法,這邊我是以取得系統時間的 Function 來做示範,其實就跟一般寫法差不多 ```swift= import Foundation import UIKit class CustomFunc { ... // MARK: - 取得送出/更新留言的當下時間 class func getSystemTime() -> String { let currectDate = Date() let dateFormatter: DateFormatter = DateFormatter() dateFormatter.dateFormat = "YYYY-MM-dd HH:mm:ss" dateFormatter.locale = Locale.ReferenceType.system dateFormatter.timeZone = TimeZone.ReferenceType.system return dateFormatter.string(from: currectDate) } } ``` 兩個合在一起就像下面這樣 ```swift= import Foundation import UIKit class CustomFunc { /// 提示框 /// - Parameters: /// - title: 提示框標題 /// - message: 提示訊息 /// - vc: 要在哪一個 UIViewController 上呈現 /// - actionHandler: 按下按鈕後要執行的動作,沒有的話就填 nil class func customAlert(title: String, message: String, vc: UIViewController, actionHandler: (() -> Void)?) { let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert) let closeAction = UIAlertAction(title: "關閉", style: .default) { action in actionHandler?() } alertController.addAction(closeAction) vc.present(alertController, animated: true) } // MARK: - 取得送出/更新留言的當下時間 class func getSystemTime() -> String { let currectDate = Date() let dateFormatter: DateFormatter = DateFormatter() dateFormatter.dateFormat = "YYYY-MM-dd HH:mm:ss" dateFormatter.locale = Locale.ReferenceType.system dateFormatter.timeZone = TimeZone.ReferenceType.system return dateFormatter.string(from: currectDate) } } ``` 今天分享的東西其實也不是很重要,不會也沒關係,只是會了之後,可以提升開發時的效率~

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